Lifting-jack.



C. M. JONES.

LIFTING. JACK.

APPLICATION FILED APR. 1, 1918.

Patented Apr. 1,1919.

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CHARLES MYRON JONES, OF NORTH YAKIMA, WASHINGTON.

LIFTING-JACK.

Application filed April 1, 1918.

Lifting-Jacks; and I do declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to lifting jacks, and it relates moreparticularly to an improved electrically operated jack.

The main object of this invention is to provide a jack that can beplaced and operated from a point distant from the jack,

principally to avoid the necessity of an automobile driver getting underthe automobile Y 15 of suitable material to constitute an ar- Whennecessary to jack up the same;

Another object is to provide an electrically operated device which isquickly and easily adjustable to either raise or lower I the objectsupported thereby;

Another object is to provide an electrically operated lifting jack withan automatic make-and-break controlled by a reciprocatory movement ofone of the elements thereof;

Another object is to provide a lifting jack of this character which iscomparatively light, compact, strong and durable;

Another object is to provide a device of this character which iscomposed of few and simple parts, so that it can be made at the minimumexpense;

Other objects and advantages may be come apparent to persons who readthe following details of description in connection with the accompanyingdrawing in which:

Figure 1 is a side elevation of the jack, its electricalconnection andthe pawl or handle whereby it is placed in its operative position.

Fig. 2 is a view observed at right angles to Fig. 1 showing the devicepartially in sections and partially in full elevation.

Fig. 3 is a View of a portion of the device, illustrating the pawlmember in a position opposite to that in which it is shown in Fig. 1;and

Fig. 4' is a horizontal sectional view taken along the line 4.4 of Fig.1.

Referring to these drawings 1n detall,

in which similar reference characters correspond with similar partsthroughout the Specification of Letters Patent.

Patented Apr. 1, 1919.

Serial No. 226,036.

several views, the jack comprises a body or standard 5, a lifting member6, bevel gear wheels 7 and 8, a toothed wheel or ratchet wheel 9, anactuating device 10, an operating device 11 and a base 12.

The standard 5 is provided with a vertical bore 13 which receives ascrew-threaded element of thelifting member 6. The gear wheel 7 isprovided with internal screwthreads which mesh with the threads ofmember 6, so that when the wheel 7 is ro- I gear wheel 8 is mounted torotate, and this wheel meshes with the wheel 7 and is integral or infixed relation with the wheel 9.

The operating device 10 comprises a bar mature or solenoid core, thismember being preferably non-cylindrical throughout its length, and beingsupported and guided by bearings 16 which are supported by the standard5. The solenoid 11 is supported by the bearings 16 and is axiallyparallel with the standard 5, so that the member 15 is also axiallyparallel with the standard 5 and non-rotatable with relation thereto.The upper end of the member 15 is slotted to receive a double pawlmember 17 which is provided with hooks or shoulders 18 and is'pivotallyconnected at 19 to the member 15. By causing the members 10 and 17 toreciprocate vertically, the wheels 7, 8 and the teeth of the form willnow be described as follows:

The member 17 is provided with a plate or projecting element 20, and tothe lower end of this plate is pivotally mounted a link 21.

Y The upper end of this link is provided with oppositely extending studs22 and 23, the

former projecting between the oppositely ex- 9 are rotated by theengagement of one of tending arms of the member 17 andbeing adapted torest alternately on these arms. To the stud 23 is connected a spring 24which has its lower end connected to the up- 'per bearing 16 andconstantly pulls the upper end of the link 21 downward soas to".pivotally mounted at 31.

.energized However, when the solenoid is deenergized, the spring 25presses the actuating member upward so that it engages with a tooth ofthe wheel 9, and when the solenoid is energized it pulls the actuatingdevice downward and thereby effects a partial rotation of wheel 9; andby repeatedly moving thus upward and downward, the lifting member 6 iseither raised or lowered, according to which end of the shoulders 18 isin its operative position.

In order to energize the solenoid 11, I provide an electric conductor 26provided with suitable connections 27, whereby it may be attached to theelectric supply system of an automobile or other source; a manuallyoperated switch'28, which may be of the push button type, as indicatedin the drawings; and an automatically operated switchsuch'as'illustrated at 29, 30 and 31.

The automatically operated switch comprises the contact 29 and lever 30which is The upper and lower ends of lever 30 are provided with cams 32and 33 respectively, these cams being movable alternately into the pathof the element 34 on the lower end of member 15.

By means of this automatically operated switch, the circuit isalternately closed and opened each time the actuating device moves upand down.

In order that this jack may be quickly, easily and conveniently placedunder an automobile or other object to be raised, I provide the standard5 with a socket 35 into which a pawl or handle 36 may be inserted. Thishandle member also being provided with an eye 37 which may be engagedwith the stud 23 for shifting the link 21 from one to the other of itsoperative positions.

' From the foregoing, it will be seen that I have provided forconveniently placing and operating a jack from a point distant from athe jack, and the operation will now be described as follows:

Having first attached the handle 36 and thereby placed the jack in itsoperative position, the connection 27 may now be engaged with a sourceof electromotive force, and the switch 28 is now operated to close acircuit, it being understood that the parts are in the position shown inFig. 3, the automatic switch being closed. The current passing throughthe solenoid 11 energizes the .same, and the solenoid draws the member15 downward until the element 34 strikes 7 the element 33 and therebyopens the switch.

This deenergizes the solenoid, so that the spring 25 is allowed to raisethe element 15 and its adjuncts. As the element 34 reaches its upwardposition it strikes the cam 32 and closes the automatic switch, therebyagain energizing the solenoid. This operation is repeated so long as theswitch 28 is held closed; but the raising operation immediately ceasesupon releasing the switch 28 and allowing it to open the circuit.

lVhen it is desired to lower the object which has been raised, the eye37 is placed over the stud 23, and the rod or handle is pushedor pulledso as to cause it to reverse the position of the pawl 17 and the switch"28 is again closed so as to cause the member 15 to reciprocate asdescribed in the foregoing. However, this reciprocation of the operatingdevice rotates the wheels 7 8 and 9 in the reverse direction fromthatpreviously disclosed, and the lifting member 6 now moves downward solong as the switch 28 is closed.

Although I have described this embodiment of my invention very minutely,it is not intended to limit my invention to these exact details ofconstruction and arrangement of parts, but I am entitled to make suchminor changes that are within the scope of the ap pended claims.

What I claim as my invention is:

1. An electrically operated jack comprising a standard, a verticallymovable lifting element, mechanism supported by the standard for raisingsaid lifting element, a recip-f electro-magnet, whereby said means movescatory device in one direction; an electro magnet for moving saidreciprocator'y device in the opposite direction, an electric conductoradapted to be in and out of circuit with said electro-magnet, and aswitch adapted to be opened and closed by movement of said reciprocatingdevice and to throw said con:

ductor in and out of circuit with said electro magnet, whereby saidmeansmoves said reciprocating device when the same has been net.

freed from its control by said electro-mag 3. An electrically operatedjack comprising a standard, a vertically movable lifting element,mechanism supported by the standard for raising said lifting element, areciprocatory device operable to actuate said mechanism; a magnetoperable to move said reciprocatory device in one direction, automaticmeans to move said device in the opposite direction, and meanscontrollable by movement of said reciprocatory device to alternatelyenergize and deenergize said magnet.

4:. An electrically operated jack comprising a standard, a verticallymovable lifting element, mechanism supported by the standard for raisingsaid lifting element, a reciprocatory device operable to actuate saidmechanism, means supporting and guiding said reciprocatory device on andparallel with said standard, and a solenoid supported by and axiallyparallel with said standard and operable to actuate said reciprocatorydevice.

In testimony whereof I have hereunto set my hand in the presence of twosubscribing Witnesses.

CHARLES MYRON JONES.

Witnesses:

Omrroan B. JONES, RoLLAND WHITMORE.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents. Washington, D. G."

